Valve-gear for steam-engines



2 Sheets-Sheet 1.

- W. WILSON.

'VALVE GEAR FOR STEAM ENGINES.

Patented Now'r. 23, 1886..

(No Mode l.)

Invenior: 1M

rt PETERS, PhnwLimu n her, Washington D c wilfn eases.

I (No ModeL) 2 Sheets-Sheet 2.

W. WILSON.

VALVE GEAR FOR STEAM ENGINES.

Patented Nov. 23, 1886.

FIG. :5:

win sses.

N. PEYERS PhuluLnMgrnpher. Wnhinglon, D C

UNIT-ED STATES PATENT OFFICE.

WILLIAM WILSON, OF BLOOM INGTON, ILLINOIS.

VALVE-GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 353,044, dated November 23, 1886.

A pplication filcd November 2, 1885. Serial No.,181,6.9.

T at whom it may c0ncern:

Be it known that 1, WILLIAM WILSON, residing at Bloomington, in the county of McLean and State oflllinois, and a citizen ofthe United States,have invented a new and useful Improve mentinValve-GearforSteam-Engines,ofwhich the following is a full description, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation looking at the outside. Fig. 2 is a plan. Fig. 3 is a section at line 00 of Fig. 2. Fig. 4 is a detail, being a side elevation of the parts shown. Fig. 5 is a side elevation-of the eccentric-lever. Fig. 6 is a top view of the same. Fig. Z represents a sliding block; Fig. 8, two views of the slotted yoke. Fig. 9 is an illustrative figure. Figs. 5, 6, 7, and 8 are enlarged.

W Letters Patent of the United States No. 327,9}7, dated September 29, 1885, have been granted to me for an improvement in Valve-gear for steam-engines. The leading objects ofthat invention were to secure more perfect movement ofthe valve or valves and at the same time maintain a constant lead, and also to provide devices to prevent the vertical movement of the axle of the locomotive with which the eccentric is connected from affecting the action of the valve-lever. travels over a fulcrum located between the axle and the center of the eccentric-lever, and this lever was fulcrumed on a radius-bar to prevent the movement of the axle from affecting the action of the valve-lever. As the fulcrum was arranged in that patent,the front end ofthe eccentric'lever traveled in an oval path, thelongest diameter of which is transverse to the lever.

My present invention is an improvement on that patent to me as aforesaid, and its leadingob- 4o ject is to secure a correct movement of the valve or valves and at the same time maintain a constant lead by more simple mechanism, which I accomplish by arranging the fulcrum of the cocentric-lever so that the path in which its forward end moves will be an oval whose greatest diameter is'in line with the eccentric-lever, instead of transverse thereto, and by other devices and combinations, as illustrated in the drawings, and hereinafter claimed.

This invention is primarily designed for use on locomotives, but may be used with station- In that patent the eccentric-lever (No model.)

ary engines. I will describe my improvements adapted for use with a locomotive.

' In the drawings, A represents the axle.

B is an eccentric-lever, connected with the axle and operated thereby as usual, the eccentric ofthe lever having a throw-at right angles with the crank.

O is a radius-bar,one end of which is arranged 'upon the axle concentric therewith. The for- D is a reversing-shaft supported in bearings b i on the radius-bars O.

c is a guide secured to the reversing-shaft D. This guide has a recess, d, on each side to receive a block, 6, Fig. 7, and the eccentric-lever is provided with trunnionsf, by which it is pivoted and fulcrumed in the blocks 6. As the axle rotates the eccentric-lever slides back and forth in the guide 0. eccentric-lever is pivoted to a block located in the slotted yoke y, from which yoke a rod, 0, extends downward, and another one, 4), upward, which rods are guided in the bearings h, suitably suppdrted. The upper rod is provided with a small yoke, t.

E is a short shaft-,supported in a bearing on the frame, which bearing is omitted in the drawings. Secured to one end of this shaft E is an arm, j, the outer end of which is pivotedto a small block located in the yoke or opening 11.

k is another arm,the lower end of which is secured to theshatt E, and its upper end is pivoted to the Valve-rod F.

G is a lever connected with the reversingshaft D, by means of which it can be operated.

In use the eccentric-lever and its fulcrum travel in the guide son the reversing-shaft D, and the circular motion of thelever at one end will be converted into an oval motion at the other end, the largest diameter of the oval being in the direction of the eccentric-lever, and

lead and lap of the valve, hence the lead most The forward end of the be constant. The eccentric-lever being fulcrumed in the guide a, and the forward end of such lever being pivoted in the yoke g, as the axle rotates the forward end of the eccentric-lever will move up and down and carry with it the slotted link 9 and rod 1;, and through j k motion will be given to the valve-rod F. I thus dispense with the independent valve-lever shown in my former patent, and provide a more direct mode of operating the valve-rod, and at the same time provide for maintaining a constant lead by simple and effective means.

The reversing-shaft can be partly rotated in its bearings,either by areversing-lever connection or automatically by a governor, as usual, and the travel ofthe valve can thus be regulated, as usual.

The operation of the radius'bar is substantially the same as that described in my former patent. It supports the fulcrum of the eccentric-lever so that the vertical movement ofthe axle does not affect its action upon the valve.

In Fig. 9 I have illustrated the movements of the rock-shaft with its guides a of the for ward end of the eccentric-lever, and of the arms j 7:, through which the valve-rod is-operated; also, the supposed vertical movement of the axle.

My invention can be used with stationary engines, in which case the radius-bar need not be used; but the rock-shaft D, with its guide,in which the eccentric-lever is fulcru med, may be supported in bearings on the frame.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of an axle or main shaft, 21 eccentric-lever, a reversingshaft carrying a guide in which the lever moves and is fulcrumed, a slotted yoke, a valve-rod, and conneetions between the yoke and valve-rod, substantially as and for the purposes specified.

WILLIAM WILSON. 

